• Views : 50k+
• Sol Viewed : 20k+

# #1 - Crossing Bridge Interview Puzzle

Difficulty Popularity

The scenario comprises of a wobbly bridge and four people. It is the night time and the people have only one torch. Without torch one may risk his life in crossing the bridge. Also we have a condition; the bridge is not quite strong and can hold only two persons together at one. The four people take different time to cross the bridge - 1 min, 2 min, 7 min and 10 min.

Since the torch is a necessity and the bride can't hold more than two persons at a time, two persons must travel at a time out of which one must return with the torch so they don't risk their life crossing in the dark.

What is the shortest time that will be required for all of them to cross the bridge?

• Views : 50k+
• Sol Viewed : 20k+

# #2 - Light Switches Interview Puzzle

Difficulty Popularity

A room has three light switches. The light switches are located outside the room with a closed door. Only one of them is the actual switch that can control the lights inside the room. You are allowed to turn those switches as many times as you wish. Please note that you can't identify from outside whether the lights are on or off.

You can enter the room only once to see the light. You can't change the light switches once you are inside. Rule out all the illogical answers like there is a window in the room or someone inside can help you with the answer etcetera.

Based on what information and guidelines have been provided to you, can you determine the exact switch that controls the light inside the room?

• Views : 40k+
• Sol Viewed : 10k+

# #3 - Popular Statement Interview Question

Difficulty Popularity

Chris Evans did a survey and found out that homeowners aged forty to fifty are more likely to purchase chocolates and are more likely to purchase it in larger amounts than members of other demographic group. According to his survey, he contradicts the popular belief that teenagers eat more chocolates than adults.

But his argument is completely flawed.

Why ?

• Views : 40k+
• Sol Viewed : 10k+

# #4 - Tricky Sequence Interview Puzzle

Difficulty Popularity

Find out the next term in the series

F21, S23, T25, T27, S29, M31, __?

• Views : 40k+
• Sol Viewed : 10k+

# #5 - Hands of Clock Interview Puzzle

Difficulty Popularity

Can you determine how many times do the minute and hour hands of a clock overlap in a day?

• Views : 40k+
• Sol Viewed : 10k+

# #6 - Empire State Building Interview Question

Difficulty Popularity

If you are offered a stack of pennies as tall as the Empire State Building will you be able to fit them in a normal room?

• Views : 40k+
• Sol Viewed : 10k+

# #7 - 2 Eggs Interview Problem

Difficulty Popularity

We have an egg problem again. There is a 36 story building for which you have complete access. You have two eggs and you must follow the below facts:

An egg that does not breaks on falling can be re used.

1) A broken egg will be discarded immediately

2) All the eggs will experience the same effect of the fall as all the eggs are identical.

3) Suppose if an egg breaks on falling from first floor, it will definitely break from all the floors above the first floor.

4) If an egg does not breaks from falling from the thirty sixth floor, it will not break from all the floor below it as well.

5) All you have to do is find out the minimum drops with which you can determine the floor which is safe to drop eggs from.

• Views : 40k+
• Sol Viewed : 10k+

# #8 - Warden and Prisoners Interview Question

Difficulty Popularity

23 selected prisoners are summoned by the warden. He gives them a choice of playing a game with him that might ensure their escape from the prison or might as well lead them towards painful death. The prisoners think that this is the only chance for them to be free again and agrees to him.

The warden tell them that there is a room which has just two switches which are labelled 1 or 2. The switches may be up or down and the condition is not known at present. They are not connected to anything. The warden may select any prisoner on any day and send him to the switch room. The prisoner will have to select any one switch and reverse its position i.e. if it is up, he will turn it down and if it is down, he will turn it up. He can and must only flip one switch and then he will be confined to his cell again.

The warden may choose the same prisoner more than one time and he will be choosing completely randomly. But at a certain point of time, everyone will have visited the switch room. And at any time, the prisoners may declare that everyone has visited the room at least once. If they will be true, they will be set free but if they will be wrong, they will be killed.

The warden gives them an hour to plan any kind of strategy and then they will be confined to their respective cells and will never be allowed to meet. What strategy can help them be free?

• Views : 40k+
• Sol Viewed : 10k+

# #9 - Poisoned Wine Interview Puzzle

Difficulty Popularity

A King has a collection of 1000 bottles of irresistible and one of the finest wines in the world. The king is quite fond of drinking which is taken to be as a weak point by the neighboring king, He creates a plan to kill the king so that he can take over his kingdom and increase his power. He send in a servant to poison the wines with a deadly virus that is so strong that even if it is diluted a million times, it will still have an effect and will kill the king over a prolonged duration of one month.

The servant is able to mix poison in only one of the wines when the guards catch him. The servant is killed and thus the truth behind which of the 1000 bottles is poisoned dies with him. The king call up his advisor who is quite clever. He tells the king something which brightens up his face. He summons some of his prisoners. Seeking what the advisor told him, he knows that he will not have to murder more than ten prisoners and he will be able to enjoy the rest of the 999 bottles of wine after a month's time.

What trick did the advisor tell the king? How will the king be able to achieve what he thinks?

• Views : 40k+
• Sol Viewed : 10k+

# #10 - Heavier Gem Interview Puzzle

Difficulty Popularity

You are given 9 gems. Out of those 9 gems, 8 weigh 1 gram and 1 weigh 2 grams. What are the minimum number of weighing in which you can find out the heavier gem in a balance and how?

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